DRR

Digitally reconstructed radiographs

DRRs are produced by tracing ray lines from a virtual source position
through the CT data of the patient to a virtual film plane. The sum of the
attenuation coefficients along any one ray line gives a quantity analogous to
optical density (OD) on a radiographic film. If the sums along all ray lines from
a single virtual source position are then displayed on to their appropriate
positions on the virtual film plane, the result is a synthetic radiographic image
based wholly on the 3-D CT data set that can be used for treatment planning.
Figure 7.10 provides an example of a typical DRR.

Pdgorsak